A multi-function printer is like a special machine that can do lots of things at once. It's kind of like a superhero that has different powers.
A multi-function printer can do four different things. It can print things like pictures and words on a piece of paper. It can also scan things, like a drawing or a letter, and turn it into a digital file on a computer. It can make copies of something, like a bunch of papers or a book. Finally, it can fax things, which is like sending a letter over the phone.
So, instead of having to buy four separate machines, a multi-function printer lets you do all of these things in one place. It's like having four different superheroes in one machine. It saves space and makes things easier!